The characteristics of Fuji IP Cassette Type PII and application for radiation oncology quality assurance tests and portal imaging

Soh, HS; Ung, Ngie Min; Ng, Kwan Hoong

doi:10.1007/bf03178589

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…Other researchers such as Peace et al [8] and Soh et al [9] have demonstrated the successful use of CR for LINAC QA. Peace et al [8] designed a test tool for light field radiation congruence by embedding a 1 mm diameter lead wires in a Perspex.…”

Section: Discussionmentioning

confidence: 99%

“…We used a double exposure technique and found a good contrast with the tungsten markers. To check the coincidence between light field and radiation field, Soh et al [9] placed four coins at each of the four edges of a square light field size (15 cm × 15 cm). They found the CR could be used even though their approach was very simplistic.…”

Section: Discussionmentioning

confidence: 99%

“…Also with the drive toward film-less and chartless radiation therapy environment, there is a need to develop ways to carry out this important QA check. To this effect, there have been proposed techniques to use computed radiography (CR) system [8,9], photodiodes [10], diodes arrays and electronic portal imaging devices (EPIDS). So far, several test tools and appropriate software have been developed to quantitatively study light and radiation field congruence using EPIDS [4-6,11].…”

Section: Introductionmentioning

confidence: 99%

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A simple quality assurance test tool for the visual verification of light and radiation field congruent using electronic portal images device and computed radiography

2012

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BackgroundThe radiation field on most megavoltage radiation therapy units are shown by a light field projected through the collimator by a light source mounted inside the collimator. The light field is traditionally used for patient alignment. Hence it is imperative that the light field is congruent with the radiation field.MethodA simple quality assurance tool has been designed for rapid and simple test of the light field and radiation field using electronic portal images device (EPID) or computed radiography (CR). We tested this QA tool using Varian PortalVision and Elekta iViewGT EPID systems and Kodak CR system.ResultsBoth the single and double exposure techniques were evaluated, with double exposure technique providing a better visualization of the light-radiation field markers. The light and radiation congruency could be detected within 1 mm. This will satisfy the American Association of Physicists in Medicine task group report number 142 recommendation of 2 mm tolerance.ConclusionThe QA tool can be used with either an EPID or CR to provide a simple and rapid method to verify light and radiation field congruence.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A simple quality assurance test tool for the visual verification of light and radiation field congruent using electronic portal images device and computed radiography

2012

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“…EPID is known as a useful QA tool for visual verification of light and radiation fields because of its high resolution, and many related studies have been reported [4,6,11,12]. In addition, various methods have been implemented to improve and supplement the disadvantages of the conventional QA method [10,13]- [16]. In QA using EPID, which replaces the film, the inconvenience caused by using the film can be improved, and the radiation field can be quantitatively analyzed.…”

Section: Jinst 17 P11038mentioning

confidence: 99%

Development of optical sensor system and hardware base frame for checking the light and radiation fields of a linear accelerator

et al. 2022

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This study aims to quantitatively evaluate the light and radiation fields of a linear accelerator by developing an optical sensor quality assurance (QA) system using a cadmium sulfide (CdS) photodetector cell and a hardware base frame manufactured in-house. The CdS photodetector cell used as the optical sensor has a size of 3.4 × 4.1 mm2, can measure up to 100 lux of light, and has a response time of approximately 20 to 30 ms. To check the alignment of the light field, it was manufactured with a CdS cell optical fiber holder, and the microcontroller board and control module were configured to scan the light field profile. Additionally, for accurate operation of the sensor, it was programmed using the integrated development environment (IDE) sketch. The alignment check of the radiation field was analyzed using the image data measured with electronic portal imaging device (EPID) using the manufactured hardware base frame. An analysis program written in MATLAB was used to evaluate the alignment of the radiation field. For symmetric fields measured using the optical sensor QA system, the full width at half maximum (FWHM) values of crossline (X) and inline (Y) profiles were 100.391 mm and 98.725 mm, respectively, for a field size of 100 × 100 mm2, and 199.093 mm and 198.886 mm, respectively, for a field size of 200 × 200 mm2. The X and Y FWHM values measured by the sensor system for the light fields were within 1 mm of the field size of the visual inspection. In addition, the FWHM value of the asymmetric radiation field measured using the fabricated frame and EPID was measured from the center bearing ball of the field to the bearing ball in each field of the four directions in the EPID image, and when the X1, X2, Y1, and Y2 jaws were opened by 50 mm, FWHM values were 50.120 mm, 50.240 mm, 48.860 mm, and 49.870 mm, respectively. The corresponding values were 99.520 mm, 99.570 mm, 99.010 mm, and 99.880 mm when the jaw fields were opened by 100 mm. The optical sensor system and hardware base frame developed in this study demonstrated the ability to evaluate both light and radiation fields more simply and quantitatively when compared to the conventional QA process. This QA system will provide medical physicists with more reliable QA results than the conventional QA method that uses graph paper and film.

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Development of light and radiation fields coincidence test toolkit for LINAC quality assurance

Lee

Cheon

Min

et al. 2022

J. Korean Phys. Soc.

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The characteristics of Fuji IP Cassette Type PII and application for radiation oncology quality assurance tests and portal imaging

Cited by 3 publications

References 6 publications

A simple quality assurance test tool for the visual verification of light and radiation field congruent using electronic portal images device and computed radiography

A simple quality assurance test tool for the visual verification of light and radiation field congruent using electronic portal images device and computed radiography

Development of optical sensor system and hardware base frame for checking the light and radiation fields of a linear accelerator

Development of light and radiation fields coincidence test toolkit for LINAC quality assurance

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